Question

2. For the formation of each of the following ionic compounds from their elements, write an overall equation showing the formation of the compound. Then write two half- equations to identify the REDOX process. (a) calcium sulfide (b) aluminum bromide (c) aluminum oxide 3. Where appropriate, construct half-equations for the following reactions and use them to balance the full equations. † † (a) 10;' ++ (b) 12 + S2032 (c) Br2 + KI (d) MnO 2 + H (e) Cro.2 + H 12 + H₂O +S.O. 2 KBr + 12 Mno: + MnO2 + H2O Cr2O72- + H20 † † 1

Answer 1

2.

I prouss (a) Calium sulfide 162* +52 Cas] Redon Reactions are Onidation: Ca - ca+2é 7 Redon Redutien;- stze -152". So, here ca i onidised by loosing ze and sulphur is and reduced by gaining 2e- (6) Aluminum Bromide Redon Reactions | Oda to; A4 – A + 3e" . Reduction't Byte - Br Overall reaction can be written by making the electrons equal ice, multiply reduction reaction with 3. So, overall seaction ů Al + 3 Br - AlBra 3 +

(c) Aluminum Cnide Overall egnation of formation is | YAl +30, 2Al2O3 Oxidation: Al Al 3432 Reduction Oqtue 20²- Now for ourall equation multiply onidation by b and Redention by 3 and then adding we get! 4Al + 302 —— 44e3*+602- or lule + 30, 2 Al₂O₃)